a+2a+3a=12

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Solution for a+2a+3a=12 equation: 


Simplifying
a + 2a + 3a = 12

Combine like terms: a + 2a = 3a
3a + 3a = 12

Combine like terms: 3a + 3a = 6a
6a = 12

Solving
6a = 12

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by '6'.
a = 2

Simplifying
a = 2

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